Thank you mysycamore and erri_wan for your remarks.
(and to Moth3r for cleaning up the post)
I will check the blueray these days.
But in the end I will have to leave it unclear where these subtitles come from, I guess. The only thing I was able to find out quite reliably is that the sounds used in that scene weren't supposed to be "dialogue" when the movie was completed in 1971, so the "idea" to subtitle it with "i can feel it" must have come up some time afterwards.
best,
tonoise